Ucenter Dress high low asymmetrical wears

Need some advice please. Dogs are already on raw. Both dogs have leishmania so have to be on a low purine diet. Yesterday took one to the specialist as she has not been well. Peeing tones and vomiting. Test etc showed her left kidney has died and is enlarged due to stones and right kidney has a few stones but is functioning. Gallbladder also enlarged with what is they believe is the beginning of a gallstone. She also has an infection in the bladder that we have been treating for the last 2 weeks. She will be going back on a new antibiotic to clear the infection and then in 3 weeks she has to have the left kidney removed as it is causing pain. I need advice on how to tweek her low purine diet. Please. Ucenter Dress high low asymmetrical wears